Common exoplanet 23 EP

BD-210397 b

RA 33.3024° · Dec -21.1962° · exoplanet

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Score breakdown

· 4 badges

23 pts · Common

Common 24 pts → Uncommon

Frozen world +8
Multi-planet system +6
Confirmed exoplanet +5
Gas giant +4

Total score 23

1 more point to reach Uncommon.

Badges

Confirmed exoplanet · +5
Gas giant · +4
Frozen world · +8
Multi-planet system · +6

Trivia

What makes it special

Frozen world. A deep-frozen world far from its star's warmth.

Could we get there?

Verdict. Hopelessly far for any craft humanity can build today.

Getting there

Aboard Voyager 1. ≈ 1.4 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 120.9 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 774 years in a starship at a tenth of light speed.
Distance. 77.4 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1949.

Saying hello

Say hello. A radio message and its reply would take 155 years round-trip.

Standing on it

A year here. A full year lasts about 5.2 Earth years.

By the numbers

Size. About 14× the width of Earth.
Volume. About 2744 Earths could fit inside it.
Mass. Roughly 214× Earth's mass — about 0.7 Jupiters.
Your weight. You'd weigh about 1.1× your Earth weight standing here.
Density. Less dense than water — drop it in a big enough ocean and it would float.
Temperature. A frigid -169°C — colder than dry ice.

How we found it

Discovery. Found by La Silla Observatory using the radial velocity method.

Cosmic context

Crowded system. One of at least 2 planets orbiting its star.

Properties

density gcc: 0.429
discovery facility: La Silla Observatory
discovery method: Radial Velocity
dist ly: 77.4046
eccentricity: 0.1
eq temp k: 104.11
insolation: 0.02
mass earth: 214
name: BD-210397 b
orbital period days: 1891
radius earth: 14
sys num planets: 2

About BD-210397 b

BD-210397 b is a common exoplanet. It lies about 77.4 light-years from Earth, has an equilibrium temperature near 104 K, spans roughly 14 Earth radii and weighs about 214 Earth masses.

A deep-frozen world far from its star's warmth.

How to see it

Like any astronomical target, BD-210397 b is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. The visibility panel above works out tonight's viewing window for your saved location.

Why BD-210397 b is a common exoplanet

BD-210397 b scores 23 points on Spacedle's rarity scale, which places it in the common tier. Another 1 point would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Frozen world and Multi-planet system — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.